As new technologies are developed for producing electricity from renewable energy sources, more and more of them are integrated into the power grid. Problem of most of the renewable energy sources is their uncertainty. Solar and wind power are highly unpredictable energy sources. While integrating expanding capacity of these technologies into the power grid, it is necessary to predict when and for how long they will be available. Cost of electricity produced from wind is already in the price range of conventional energy sources. Scope of this paper will be exploring integration of wind turbines into the power grid, adressing problems between predicted and actual production and solutions of this problem from a technical and economic viewpoint.